GOST 27266-87. Molybdenum wire for light sources. Technical conditions.
You are interested in GOST 27266−87. «Molybdenum wire for light sources» from the supplier company AvecGlob? Here you will find interesting information on this topic.
Application area
The effect of this standard applies to molybdenum wire, which is obtained by powder metallurgy methods, and which is used in the production of light sources.
Technical requirements
The wire grading must meet the requirements of GOST 18905.
Type, group and range of diameters of the produced wire are given in the table:
| The molybdenum- den |
Appointment | A type | Group | Range of wire diameters, μm | Precision of manufacturing |
| MCH | Cores for the manufacture of monospires from tungsten wire, hooks, supports and other details of lamps | TO | A | 30−2500 | Increased, normal |
| MCH | Also | B | 15−400 | Normal | |
| Core spiraling for manufacturing of tungsten bispiralles | COP | A | 45−300 | Increased | |
| Auxiliary spirals | Sun | A | 45−120 | Increased | |
| MK | Inputs, supports, traverses of powerful and some special incandescent lamps, cathodes of gas-discharge devices, etc. | - | A | 200−2500 | Normal |
| MRN | Inputs, cores for spiraling tungsten and its alloys, traverses | - | A | 600−2500 | Normal |
Supplier — AvekGlob Company — offers molybdenum wire of various diameters at a reasonable price from the manufacturer, which meets the requirements of GOST 27266−87. The supplier guarantees the timely delivery of products to any address specified by the consumer.
Chemical composition and performance characteristics
The chemical composition of the wire should correspond to that given in the table:
| Molybdenum brand | Mass fraction of molybdenum,%, not less than | Mass fraction of additive,% | Mass fraction of the sum of impurities,%, not more than |
| MCH | 99.96 | - | 0.04 |
| MK | 99.92 | Silicon 0.019−0.04 | 0.04 |
| MRN | 99.92 | - | 0.08 |
Note. The amount of impurities includes elements: calcium, magnesium, silicon, nickel, iron, aluminum, if they are not additives.
Wire surface quality
The color of a group A wire with a diameter of 400 μm or less should be from black to dark gray, with a diameter of more than 400 μm — from black to light gray. On the surface of the wire of group B, traces of lubrication, oxidation and other impurities are not allowed.
Wire should be without burrs, bundles, cracks. On a wire with a diameter of 500 μm or more, burrs and risks are allowed that do not lead the wire beyond the limit deviations in diameter.
The mechanical properties of the wire in the tensile test must meet the requirements given in the table:
| Molybdenum grade, type | Group | Diameter of wire, micron | Conditional tensile strength per 200 mg of material, MPa | Temporary resistance to tearing, MPa, not less than |
| MK | A | 200 to 500 | 588.0 | 1186.0 |
| MCH-K | A, B | 15 to 70 | 833.0 | 1695.0 |
| «71» 90 | 784.0 | 1597.0 | ||
| «91» 200 | 686.0 | 1392.0 | ||
| MF-KS, | A | 45 to 70 | 735.0 | 1490,0 |
| MCH-VS | «71» 90 | 686.0 | 1392.0 | |
| «91» 200 | 588.0 | 1186.0 |
The density of the final product after deformation is not less than 10280 kg / m 3 .
Supplier — AvekGlob Company — offers to purchase molybdenum wire in a wide range of diameters, and in various unwinding, which meets the requirements of GOST 27266−87. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.